Abstract

We report on the InSAR-related results of the National Research Project (PRIN) entitled "Advanced technologiesin the assessment and mitigation of the landslide risk: precursors detection, previsional models and thematicmapping", funded by the Italian Ministry for Scientific Research. In the framework of the project, multi-temporalinterferometric techniques were applied to time series of SAR data, from legacy ERS and ENVISAT, as well ashigh-resolution TerraSAR-X sensors. We report on the final outcomes of the project, which concentrate on twosites of the Apulia Region, representative of terrain instability problems widespread in the area.The fist one is the coastal area near the Lesina Marina tourist village, at the north of the Region, close to theGargano promontory, where the excavation of a canal exposed grey micro- and meso-crystalline gypsum which isnow showing a high density of cavities and sinkholes due to gravitational collapse processes. A slow but steady upliftphenomenon has been detected by processing through persistent scatterers interferometry (PSI) methodologiesERS and ENVISAT data, acquired in both ascending and descending geometries, and spanning a total time intervalfrom 1995 to 2010. The displacement data were validated by comparison with leveling measurements performedin 2000 and 2010. Derived vertical displacement rates exceed 3-4 mm/y on locations adjacent to the canal, gentlydecreasing towards the western end of the built up area. These observations, supported by ancillary data and insitu investigations performed in the past, seem compatible with processes such as diapirism or the hydration of theresidual anhydrite in the core of the gypsum mass.The second site is an inland landslide area close to the municipality of Carlantino, in the Daunia mountains. Here,a relatively large landslide affects the slopes spreading from the town outskirts to the banks of the Occhito lake, anartificial basin formed by a dam on the Fortore river. PS targets detected by both C- and X-band data correspond tourban structures or peri-urban walls and guard rails, while the landslide body is almost completely devoid of stabletargets, due to the vegetation cover. In order to allow stability monitoring through spaceborne SAR interferometry,a network of passive reflectors was designed and deployed on the area of interest. To design the corner reflector(CR) network, different factors were taken into account: the visibility of the CR by the satellite in terms of geometryand radiometry, the accessibility of the location on the ground, and the relative distance between CR. Resultsof the comparison of phase data over the CR with that of surrounding objects are presented.Work supported by the Italian Ministry of Research in the framework of PRIN 2008 research grant "Advancedtechnologies in the assessment and mitigation of the landslide risk: precursors detection, previsional models andthematic mapping". Te

Autore Pugliese

• Refice Alberto , Bovenga Fabio , Pasquariello Guido

Tutti gli autori

• A. Refice ; F. Bovenga ; G. Pasquariello ; G. Spilotro

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Anno di pubblicazione

2013

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